Trimming the seam allowance at a corner is the best way to make a sharp finished point. The little wedge of fabric removed from the seam allowance means less bulk so the corner is flat and sharp. Here's how to do it.
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Stitch the seam, pivoting the stitching at the corner. Cut across the corner of the seam allowance, close to, but NOT through, the stitches.

Turn to right side. Use a chopstick or eraser end of a pencil to carefully push out the corner from the inside. (If you push too hard, you can make a hole in the corner.)

Press edges flat. The finished corner has less fabric inside and looks good from both sides.

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